# CVE-2026-14511: IBM MQ C client library denial of service

Source: https://junglewise.ai/threats/cve-2026-14511-ibm-mq-9-4-5-0-through-9-4-5-1-could-allow-an-authenticated-user  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-19. Updated: 2026-10-19  
License: CC BY 4.0 with a link back

CVE-2026-14511 · Severity: medium · CVSS 6.5 · Published 2026-10-19

IBM MQ is a messaging middleware that allows applications to exchange data reliably across networks. An authenticated attacker can send a specially crafted message to crash consuming applications, disrupting message processing and availability. This impacts any environment relying on MQ for critical business communications.

Technologies: [IBM Mq](https://junglewise.ai/threats/technologies/mq). Vendors: [IBM](https://junglewise.ai/threats/vendors/ibm).

## Quick answers

**Is CVE-2026-14511 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-14511 being exploited in the wild.

**How severe is CVE-2026-14511?** Medium severity, with a CVSS score of 6.5, published 19 October 2026.

**Which products and versions are affected?** IBM Mq 9.4.5.0 through 9.4.5.1.

**Is there a fix for CVE-2026-14511?** Yes: fixed in IBM MQ 10.0.0.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-14511 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-14511?** Check whether you run IBM Mq at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in IBM MQ 10.0.0.0

## Technical details

A resource allocation vulnerability (CWE-770) in the IBM MQ C client library allows an authenticated user to trigger uncontrolled resource consumption via a specially crafted message, causing the consuming application to crash. The attack requires network access and valid authentication credentials; no user interaction is needed. A fix is available in IBM MQ 10.0.0.0.

## Affected products

- IBM MQ 9.4.5.0 through 9.4.5.1

## Timeline

- 2026-10-19: disclosed

## References

- [https://www.ibm.com/support/pages/node/7290859](https://www.ibm.com/support/pages/node/7290859)

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